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3.3.4.2 Flexural properties
Flexural properties of HDPE, PET, their blends, and composites
were examined according to ASTM D5943 using an Instron universal testing machine
(model 5565) with a load cell of 5 kN and a crosshead speed of 5 mm/min. The three
points bending test figure was followed to determine the flexural properties. The
specimen length was 70 mm and span length was 56 mm. Five samples were tested in
each blend sample.
3.3.4.3 Compressive properties
Compressive properties of recycled HDPE/PET blends and
composites were examined using an Instron universal testing machine (model 5565)
with a load cell of 50 kN, a crosshead speed of 1.27 mm/min. Compressive test was
performed according to ASTM D695. The rectangular specimens from compression
molding were cut to a width, thickness, and height of 12.7 by 12.7 by 25.4 mm.,
respectively. Five tests were performed in each blend sample.
3.3.4.4 Izod impact properties
Impact properties of HDPE, PET, their blends, and composites
were studied using an Atlas testing machine (model BPI). Impact tests were performed
according to notched Izod impact strength (ASTM D256). The total impact energy of
2.7 J was selected. The test specimens with 12.7 mm in thickness, 64 mm in length,
and 3.5 mm in width were prepared by injection molding. Ten specimens were tested.
The impact resistance was reported as impact strength (J/m 2 ) that was the failure
energy divided by the cross section area of the sample.
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